powebs



G. G. POWERS.

HYPODERMIC SYRINGE.

APPLICATION FILED ocT.15.I9I.

Patented Sept. 30, 1919.

LIILST WML @PY pM, mK. Mw W w M e .W @Ma t Wm, We ,n mw@ ,O/

nrronnniurc sumaron.

Specification of Letters Patent.

Patented sept. so, isis.

Application ined october 15, 191%. Serial Eto. 258.132.

To all whom t may concern:

Be it known that LGrnonon G. Fownus, a citizen of the United Statearesiding at llos Angeles, in the county of Los Angeles, State of California, have invented new and useful improvements in ltlypodermic Syn inges, of which the following is a specification.

rllhis invention relates generally to hypoderinic syringes and more particularly to that lrind of hypoderinic syringe shown and explained in my Letters Patent No. 1,217,630, dated February 27, 1917, andin an application copending herewith Serial No. 219,300, filed February 26, 1918.

lit is a general object ofthis invention to provide improved construction for hypodermic needles; and the detailed objects and features of the invention will be best understood from the following detailed descrip tion of a preferred form of hypodermic needle construction embodying the invention, reference for this purpose lbeing had to the accompanying drawings in which*- Figure 1 is a longitudinal sectional view showing a 'i complete hypoderinic syringe,

said view being about twice the size of the usual syringe; Fig. 2 is an enlargedv detail of a part of the construction shown in Fig. 1; Fig. 3 is a sectional detail showing a slight modification' of form; and Fi f1 is a sectional detail showing how the or inary needle may be mounted uponmy hypodermic syringe. L i

yllhe present improved form of syringe is adapted to take either the ordinary form of 'needle shown in Fig. et (a needle provided with a cap which screws onto a nipple on the forward end of the syringe body) or to 'taire that form of hypodermic needle which is equipped with a mounting collar, as shown 'in Figs. 1, 2 and 3. And intaking this last mentioned form of hypodermic needle, the construction has features of advantage which will be hereinafter pointed out. i

The syringe may comprise a barrel 10 having suitable handles 11, and a plunger 12 worlrs in the barrel, the plunger being i provided with a suitable handle 13. 'lhe lower or inner end of the plunger may be hollow as shown at 11i (and as generally described in my said issued patent). For the purposes of facilitating cleaning of the hol low 1e, ll now make the end of the plunger, as shown at 12", screw-threadedly separable from the body of the plunger 12b; so that the part 12 may be removed for cleaning out the hollow 111. rllllie hollow 14 is provided for thepurpose of accommodating the inner end 15a of a double ended needle 15. A. syringe rovided with a hollow plunger may take either a single ended or a double ended needle.

rllhe forward end of the syringe barrel is provided with a somewhat reduced (but still comparatively large) portion 16 which has screw threads 17 and a cap 18 screws upon these screw threads; the function of the ycap being to hold the needle 15 in place. Now in the specific form of syringe described in my said `cri-pending application l have shown the reduced portion 16 as being somewhat conical in formation and eX- tending down to asmall end, said small end forming the bearing surface against which one end of needle mounting collar 20 is pressed. ln the specific form now here described, instead of making this portion.

16 conical, l provide it with an extending nipple 21 whose outer end provides theseat against which one end of the mounting collar 20 is pressed, the other end of the mounting collar being pressed against by the inner cavity surface 22 of the cap 18. Now this inner cavity surface of cap 18 is -preferably substantially conical in its configuration, so that all parts of the cavity (including the screw threads at 17) within the cap 18 are larger than the small end in which collar 20 is seated and, specifically, are substantially larger than the nipple 21 whose end is of substantiallyy the same size as the smaller end of the cavity. rlhis provides that when the collar is expanded by reason of longitudinal compression, and even if that expansion causes the periphery of the collar to bear against the inner wallof the cap, the mounting collar and the needle cannot become hound in the ca because the conical form of the cavity a ways, allows the mounting collar to be easily moved out of the-cap. This is an important feature of this specific form of syringe; and this feature appertains whether the mounting collar 20 has an exterior ring or coating of hard metal as indicated at 20 in Fig. 2 or whether the mounting collar, as shown at 22 in Fig. 3, is merely e globule of een; metal. ln the case shown in Fig. 3, using that form of mounting collar, I prefer to make the smaller inner end of the cap cavity a round surface as indicated at 22a, so that the globule of soft metal may bed against that surface more or less spherically; and this form of cap cavity may be used also for the form of mounting collar shown in Fig. E may be used universally with any of the di'erent forms of mounting collar. And the conical form of the cap cavity is particularly eflicacious in connection with the soft mounting collar, as shown in Fig. 3, because the conical side walls at 22h then become the limiting means for limiting the amount of lateral expansion of the mounting collar; and at the same time the mounting collar is easily moved out 0f the cap when the cap is removed from the syringe. Limiting the lateral expansion of the mounting collar (of any form) causes it to compress tightly and form a tight joint around the needle, when the collar is compressed longitudinally.

rlhis feature of the nonbinding of the mounting collar and needle in the cap-the conical form of the cap cavity-is also eX- plained and set forth in my said copending application; but the adaptation of the syringe to take either the form of4 needle shown in Figs. 1, 2 and 3, or that shown in Fig. 4, is peculiar to the syringe shown in this application. rlhe nipple 21,'instead of being preferably made integrally with the part 16, is preferably made separate 'from that part and screw threaded into it, as is well shown in the drawings, so that if the nipple should bre-ak olf it can be easily removed from the syringe and replaced by the new one.'l This nipple-21 is of a standard size adapted to take the ordinary form of hypodermic needle as indicated at 15c in Fig. 4, being that form which has a cap 15c1 adapted to screw upon the nipple 21. And

the base of the nipple is preferably enlarged at 21"?1 so that, if it breaks, it will do so at the base of the smaller outer portion, leaving the base part projecting from the part 16 where it is easily engaged with a tool and easily removed.

asias/ie Having described a preferred forni Gf my invention, l claini 1. ln a hypodermic syringe, a barrel with an orifice at its end, a projecting screwthreaded nipple through which the orilce extends, screw threads on the barrel at the base lof the nipple substantially larger than the nipple, and a hollow cap adapted to fit over the nipple and screw upon said screw threads.

2. In a hypodermic syringe, the combination of a barrel with an orifice at its end, a nipple at the end of the barrel through which nipple the orifice extends, said nipple being externally screw-threaded and adapted to take the ordinary cap-type nee/fle; the end of the barrel having at the bas-e of the nipple a screw thread substantially larger than the nipple, and a hollow cap adapted to screw upon said screw threads and to inclose the nipple, said cap having an end perforation to pass a needle and adapted to hold the mounting collar of the needle against the end of the nipple.

3. In a hypodermic syringe, the combination of a barrel with an orifice at its end, a nipple at the end of the barrel through which nipple the orifice extends, said nipple being externally screw-threaded and adapted to take the ordinary cap-type needle; the end of the barrel having at the base of the nipple a screw thread substantially larger than the nipple, and a hollow cap adapted toscrew upon said screw threads and to inclose the nipple, said cap having an end perforation to pass a needle and adapted to hold the mounting collar of the needle against the end of the nipple, said cap having a conical interior and having its smallest part at and surrounding the end of the nipple.

` 4. In a hypodermic syringe a barrel, and

a plunger therein comprising two separable parts, the end part olf the plunger farthest within the barrel being longitudinally hollow and separable from the other part.

ln witness that l claim the foregoing l have hereunto subscribed my name this 2d day of October, 1918.

GRU. G. PUWERS; 

